bemade-addons/bemade_partner_email_domain/data/template_data.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data>
        <template id="error_page">
            <base href="/" />
            <t t-call="website.layout">
                <div id="wrap">
                    <t t-if="error_message">
                        <div class="alert alert-danger"><t t-esc="error_message"/></div>
                    </t>
                    <t t-if="confirmation_message">
                        <div class="alert alert-success"><t t-esc="confirmation_message"/></div>
                    </t>
                </div>
            </t>
        </template>
    </data>
</odoo>